Currently waiting for my ticket & have decided on exactly the same set up- Regal FAC & Mamba lite scope.
I believe you can get the Regal in 30 or 40 ft lbs with a corresponding difference in the number of shots.
Have you noticed much of a power curve? I'd be interested to know what advantage the 40ftlb version has given it will have fewer shots and will probably only be accurate with the heaviest pellets.